East Fork Big Creek Dam A- 40 Reservoir Report
Last Updated: December 12, 2025
East Fork Big Creek Dam A-40, located in Harrison, Missouri, is a key structure designed by the USDA NRCS for grade stabilization along the East Fork Big Creek watershed.
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Summary
Completed in 1962, this earth dam stands at a height of 26 feet and has a length of 470 feet, providing a storage capacity of 136 acre-feet. The primary purpose of the dam is to prevent erosion and stabilize the surrounding land, with a spillway width of 50 feet and a maximum discharge of 777 cubic feet per second.
This dam plays a crucial role in managing water resources in the area, with a low hazard potential and a moderate risk assessment rating. Despite not being state-regulated or inspected, it serves as a vital infrastructure for the local government in Bethany, Missouri. With a surface area of 3 acres and a drainage area of 16 square miles, East Fork Big Creek Dam A-40 is an essential component in the conservation and preservation of water resources in the region.
For water resource and climate enthusiasts, East Fork Big Creek Dam A-40 represents a testament to the collaborative efforts of the USDA NRCS in sustainable water management. Its construction and design reflect a commitment to environmental conservation and the protection of natural habitats. As climate change continues to impact water availability and quality, structures like this dam play a crucial role in ensuring the resilience of ecosystems and communities in the face of changing conditions.
Year Completed |
1962 |
Dam Length |
470 |
Dam Height |
26 |
River Or Stream |
TR-EAST FORK BIG CREEK |
Primary Dam Type |
Earth |
Surface Area |
3 |
Hydraulic Height |
26 |
Drainage Area |
16 |
Nid Storage |
136 |
Structural Height |
28 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
28 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
East Fork Big Creek Dam A- 40